Water-tube boiler.



D. S. JAOOBUS.

WATER TUBE BOILER. APPLICATION FILED JULY 16, 1912.

Patented Aug. 11, 1914.

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DAVID S. JACOBUS, 0F JERSEY CITY, NEW ZlE-RSEY, ASSIGNOIt TO THE BABCOCK 8t WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CQBEORATION OF NEW JERSEY.

WATER-TUBE BOILER.

moon-es.

To all whom it may concern Be it known that 1, DAVID S. J'AoonUs, a citizen of the United States, residing at Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in W'atenT ube Boilers, of which the following is a specification.

My invention relates to a Water tube boiler and more particularly to a means for ad mitting air at the center of the fuel chamher in a. type of boiler having an Ashaped combustion chamber of relatively large volume, although it is not limited to the use of such av furnace.

In the particular application of my invention illustrated in the accompanying drawings, the combustion chamber extends beneath the entire boiler and is fired from both the "front and rear, the purpose being to supply airfor combustion to the unconsumed carbon lying adjacent to the side walls of a division wall extending transversely of the fuel chamber. 7

In the drawings Figure 1 is a longitudinal section through a boiler of the type referred to, showing one application of my invention; and Fig. 2 is a section illustrating a modification of the divisionwall.

Similar reference numerals indicate similar parts in the two views.

The particular boiler selected for the purpose of illustrating my invention, is a type comprising units symmetrically disposed over a common combustion chamber and -.iiorming between them an t l-shaped combustion chamber of relatively large volume. In recent tests with a' boiler of this type, com bining large furnace volume with the par ticular form and height of furnace, the width of the furnace from one side to the other of the boiler being about 26% feet, the depth from the front to the rear oat"- the boiler about 1 1 feet, and the height, measured above the dumping plates to the top of the first battle, about 29 test, it was found that the admission of air, in the manner herein described, led to better efiiciencies with certain grades of coal than were secured with out it.

Suiiicient parts of the boiler are shown the present purpose. It comprises two units each consisting of two banks of tubes, lezit hand unit havins and rear Specification of Letters Patent.

Application filed July 16, 1912.

tubes 4% into a drum 11, the steam spaces of division wall 22 and, directing the Patented Aug. 111i, M9314. Serial No. "109,770.

banks 1 and 2, and the right hand unit, front and rear banks 3 and 4-. The tubes of the left hand unit are expanded into a water drum 5 and those of the right hand unit into a water drum 6, the said drums being located above the furnace arches 7 and 8. lhe up per ends of the tubes of banks 1 and 8 are expanded into a middle steam and water drum 9; the tubes 2 into a drum 10, and the said drums being connected by pipes 12 and their water spaces by pipes 13. All of these drums extend transversely of the setting. Battles 1% and 15 extend upwardly from the drums 5 and 6 and are supported upon the back row of tubes of banks 1 and 3 respectively. Additional bottles 16 and 17 extend downwardly from the roof .to properly direct the course of the 'ases along the tubes to the two outlet lines 26 and 27. Superheaters 18 and 19 are supported in the spaces forming the downward passes of the gases between the sets of battles.

The fuel chamber extends beneath the entire boiler and comprises two inclined stokers, one at the -front and the other at the ac rear 01 the boiler, each stoker having dumping plate at the bottom. In the drawings I have shown only the supports 20 and 21 for the stoker grate bars and the uipports to which the dumping plates are h ed. A 85 low division wall 22 extends transi steely oi the "furnace between the two stothe dumping plates being adjacent the sine walls of the division wall In the operation of stokers of the do eescribed, the ash is gotten rid of byduniping; it at times from the dumping plates in the use of such plates there is usua siderable ioss through unconsumecl on tible matter in the ash, and the p the present invention is to burn bustible matter out of the coke o spent coal lying on the dumping p well as to supply air at the middle oi the furnace, by admitting air above the echo or is":

,1. ...S in toe partly spent coal through openings ward on top of and across this as to burn the combustible top part of the bed of ing on the dumping pie c the wali is made hello or with a suitable duct, side w formed with wall, said pipe being formed with openings which will register with the openings 23. The openings' 23 are set at such a height that the air supplied throu h them will blow over and impinge on t e top of the partly spent coal and clinkers lyin on the dumping plates adjacent to the si e walls,

' and thus supply the necessary oxygen for burning out the unconsumed combustible matter. Additionally, a certain amount of air along the middle of the furnace has been found to increase the economy under certain operating conditions by burning the combustible gases distilled from the coal.

The openings 23 may be inclined downward, but in the form shown in Fig. 1 it has been found in practice that the slag which runs down the faces of the wall 22 forms a hood over the openings and causes the air to be deflected downward in the way intended. In order however to simplify the construction the openings were made horizontal.

It is preferred to supply the air under pressure and for that purpose the pipe 24 may be connected to any suitable source of supply, valves or. other devices in the pipe being employed to regulate the amount of air and its pressure.

'By the use of a supplementary supply of air playing'downward upon and. across the fire on the dumping plate of a stoker for burning out the combustible from the ash which collects on the dumping plate, it is possible to keep the fire on the plate at a predetermined thickness without reference to the thickness on the main part of the grate.

In Fig. 2 a slight modification is shown in which the sides of the division wall are provided with water boxes 25 and 26, the

air openings between the boxes being inclined downward. In this construction the air is supplied through a duct in the division wall. I

\Vhat I claim is:

1. In combination, a steam boiler, a furnace'therefor, a bridge wall having openings therein, and means for admitting air through said openings so as to make it impinge on'the top of the fire adjacent the bridge wall for the purpose described.

2. In combination, a steam boiler, a stoker having at its rear a dumping plate, and'a bridge wall, said bridge wall having air openings so arranged as to direct the incoming air downward on top "of and across the surface of the fire on the dumping plate. 1

3. In combination, a steam boiler, a furnace therefor, a dumping plate at the rear of the furnace and adjacent a bridge wall, said bridge wall having openings therein, and means for admitting air through said openings soas to make the air impinge on the top of the fire carried by the dumping plate for the purpose of burning the combustible elements contained in the material lying on the dumping plate.

4:. Incombination, a steam boiler, a centrally disposed combustion chamber extending beneath the boiler, a bridge wall through the center of said chamber, said wall having water boxes in the sides thereof and openingsbetweensaid boxes, and means for supplying air for combustion through said openings.

5.- In combination, a steam boiler, a centrally disposed combustion chamber extending beneath the boiler, through the center of said chamber, said wall having openings in the sides thereof,

and means for supplying air for combustion through said openings and for causing air to play downwardupon and across the top of the spent fuel adjacent to said wall.

a bridge wall 6. In combination, a steam boiler, a centrally disposed combustion chamber extend- ,ing beneath the boiler, stokers one at the front and the other at the rear of the boiler said stokers having dumping plates, a bridge wall through the center of the. chamber, said wall having openings in the sides there of, and means for supplying air for combustion through said openings and for causing the air to blow over and impinge on the top of the partly spent coal lying on the dumping. plates adjacent to said wall.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

. DAVID s. JACOBUS.

Witnesses:

' W- F. FLEMING,

E. P. TERRY. 

